Hi chaps, I've got a strange clunking sound when I go full lock in both directions, it only happens when you do full lock and Immediately release. When you go full lock-release you get the clunk! Any ideas?

"Could be" steering rack related. I have that same noise in mine and have been told I need a new steering rack however cannot replicate as shown in the video but can when on a ramp. Do you have any play in the steering?

While researching if steering rack or not, etc... I came across a number of threads talking about the issue being present when turning the wheel.

So you might want to get a suspension/steering inspection to confirm?

Note: I am not a mechanic or much of a car DIY'er so just passing on what I have found.

Sorry to say same thing happened to my e46 after I hit a pothole while going right on a roundabout. Result was a new steering rack.

Had same issue about replicating it turned out it would only do it when cold and engine not running otherwise you couldnt hear it over the diesel clutter. As soon as I got it to make the sound and mine did it with wheels straight it took about 20 sec to get a new rack approved

my wife reversed car into skip, how do you miss a ten tonne bright yellow skip? Anyway having the damage repaired, the guy at the garage said that there was a groan on the steering(fullish lock) at low speeds i.e when setting off/parking at low speeds. He also complained about the steering being very heavy. He said the tyres were only at 15 psi. I have to admit Ive never checked them in a year (sorry)which I will do In future.
The body-shop guy who is really friendly and honest has a 530i and he thinks the steering is much lighter on his, I am a bit ham fisted and really like the heavy steering as it feels like I am doing something, I really don't want light steering or I might as well get a Hyundai i10?.
Having said that we are going on a family holiday to France approx, 1000mls each way, I am concerned if there are any well documented faults? such as steering rack or power steering pump? my sprinter van and previous cars have all made similar noises on full lock, any suggestions appreciated

Is yours a electric or hydraulic steering system? Electric ones have a known fault (dealers should know about it) and they will usually replace the steering rack. The new part is modified to prevent this issue.